This sensitive, delicately pretty leading actor, mostly on TV, came to fame as a girl playing Laura Ingalls on the NBC period drama series, "Little House on the Prairie" (1974-82), based on the stories by the adult Ingalls. Gilbert has made few feature film appearances, but kept busy on the small screen, for a time recreating famous suffering teenager film roles in TV-movies like "The Miracle Worker" (1979), "The Diary of Anne Frank" (1980) and "Splendor in the Grass" (1981). She remained very prolific and gradually managed the transition to adult roles in TV-movies including "Choices" (1986), "Forbidden Nights" (1990) and "A Family of Strangers" (1993). Gilbert also occasionally tried TV series again, but "Little House: A New Beginning" (1982-83), "Stand By Your Man" (1992) and "Sweet Justice" (1994) didn't catch on. In 1995, she married actor Bruce Boxleitner.

Gilbert continued to star in a regular slate of TV movies of varying distinction throughout the late 1990s and 2000s, but in those years was perhaps best known for a behind-the-scenes roll, elected in 2001 as president of the Screen Actors Guild. Gilbert was a highly visible and occasionally controversial leader for the thespian's union, presiding over several bitterly fought negotiations than frequently prompted divisions and personal animosity within SAG's ranks--Nevertheless, she was eleceted to a second term in a viciously contended election in 2003. By 2005, however, she had her fill of fighting political battles and chose not to run for a third term, claiming that she felt she could no longer bear the tensions within the union and that the damaged relations between herself and fellow officials could never be healed.